<?php

namespace PHPExcel\Writer\Excel2007;

/**
 * \PHPExcel\Writer\Excel2007\WriterPart
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * @category PHPExcel
 * @package PHPExcel_Writer_Excel2007
 * @copyright Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
 * @version ##VERSION##, ##DATE##
 */
abstract class WriterPart {
    /**
     * Parent IWriter object
     *
     * @var \PHPExcel\Writer\IWriter
     */
    private $parentWriter;
    
    /**
     * Set parent IWriter object
     *
     * @param \PHPExcel\Writer\IWriter $pWriter            
     * @throws \PHPExcel\Writer\Exception
     */
    public function setParentWriter(\PHPExcel\Writer\IWriter $pWriter = null) {
        $this->parentWriter = $pWriter;
    }
    
    /**
     * Get parent IWriter object
     *
     * @return \PHPExcel\Writer\IWriter
     * @throws \PHPExcel\Writer\Exception
     */
    public function getParentWriter() {
        if (!is_null($this->parentWriter)) {
            return $this->parentWriter;
        } else {
            throw new \PHPExcel\Writer\Exception("No parent \\PHPExcel\\Writer\\IWriter assigned.");
        }
    }
    
    /**
     * Set parent IWriter object
     *
     * @param \PHPExcel\Writer\IWriter $pWriter            
     * @throws \PHPExcel\Writer\Exception
     */
    public function __construct(\PHPExcel\Writer\IWriter $pWriter = null) {
        if (!is_null($pWriter)) {
            $this->parentWriter = $pWriter;
        }
    }
}
